Update `expr` matcher for Edition 2024 and add `expr_2021` nonterminal#123865

Merged

bors merged 6 commits intorust-lang:masterfrom eholk:expr_2021

May 18, 2024

+204-24

Commits on May 17, 2024

Update compiler/rustc_parse/src/parser/nonterminal.rs

eholk
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fmease
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